ACL limits issues

If you keep within the supported limits of ACL usage as shown in the table below, you are unlikely to run into system limits issues. ACLs should instantiate quickly and correctly.

The following software limits apply to ACL names:

The following table displays the maximum numbers of ACLs and ACL rules supported for each device.

Table 1. ACL and rule software limits

ACL type (standard and extended)

Maximum ACLs per type per device

Maximum rules per ACL

Maximum total rules per ACL type

Layer 2

2048

2038

102400

IPv4

2048

2048

102400

IPv6

2048

2048

102400

As you approach or exceed combinations of these limits, you might encounter slow instantiation of ACL rules.

Delays of several minutes can occur in the instantiation of ACL rules and counters if the number of ACLs or VLANs is excessive.

To display the hardware instantiation status (Active/Partial/In Progress/Inactive), run the show access-list command.